This seminal work by John Dewey provides a comprehensive examination of how we think, why proper training is essential, and how education can foster effective habits of reflection. Dewey begins by defining thought in its various senses, distinguishing idle daydreams and uncritical beliefs from true reflective thought, which involves active, persistent, and careful consideration of any belief in light of its supporting evidence. He analyzes the central factor in thinking: the function of one thing signifying another, which transforms a perceived fact into evidence. Dewey then explores the natural resources available for training thought, emphasizing curiosity, suggestion, and the ordering of activities through play and work.
He examines school conditions and the obstacles they present, critiquing over-reliance on rote memorization, isolated subjects, and external standards that hinder genuine inquiry. The second half of the book delves into logical considerations, breaking down the complete act of thought into five distinct steps: a felt problem, its definition, the suggestion of a solution, the reasoning out of its implications, and experimental verification. Dewey contrasts empirical thinking, which relies merely on repeated conjunctions of events and fosters mental inertia, with scientific thinking, which utilizes systematic induction, deduction, and controlled experimentation. Finally, the author discusses the pivotal roles of activity, language, observation, and information in cultivating independent, disciplined minds capable of navigating complex intellectual and practical challenges.